1999 TOYOTA CAMRY heater
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DI00I±11
DI±14
± DIAGNOSTICSENGINE
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for that code listed
in the table below. For details of each code, turn to the page referred to under the ''See page '' for the respec-
tive ''DTC No.'' in the DTC chart.
1. SAE CONTROLLED
DTC No.
(See page)Detection ItemTrouble AreaMIL*Memory
P0105
(DI±22)Manifold Absolute Pressure/
Barometric Pressure Circuit Mal-
functionOpen or short in manifold absolute pressure sensor circuit
Manifold absolute pressure sensor
ECM
P0106
(DI±25)Manifold Absolute Pressure Cir-
cuit Range/Performance Prob-
lemVacuum line
Manifold absolute pressure sensor
P0110
(DI±26)Intake Air Temp. Circuit Malfunc-
tionOpen or short in intake air temp. sensor circuit
Intake air temp. sensor
ECM
P0115
(DI±30)Engine Coolant Temp. Circuit
MalfunctionOpen or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
P0116
(DI±34)Engine Coolant Temp. Circuit
Range/Performance ProblemCooling system
Engine coolant temp. sensor
P0120
(DI±35)Throttle/Pedal Position Sensor/
Switch ºAº Circuit MalfunctionOpen or short in throttle position sensor circuit
Throttle position sensor
ECM
P0121
(DI±39)Throttle/Pedal Position Sensor/
Switch ºAº Circuit Range/Perfor-
mance Problem
Throttle position sensor
P0125
(DI±40)Insufficient Coolant Temp. for
Closed Loop Fuel Control
Open or short in A/F sensor (bank 1 sensor 1) circuit
A/F sensor (bank 1 sensor 1)
Air induction system
EGR system
Fuel pressure
Injector
Gas leakage on exhaust system
ECM
P0136
(DI±45)Oxygen Sensor Circuit Malfunc-
tion (Bank 1 Sensor 2)Open or short in heated oxygen sensor circuit
Heated oxygen sensor
P0141
(DI±47)Oxygen Sensor Heater Circuit
Malfunction (Bank 1 Sensor 2)Open or short in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
ECM
P0171
(DI±49)System too Lean (Fuel Trim)
Air induction system
Injector blockage
Manifold absolute pressure sensor
Engine coolant temp. sensor
Fuel shutoff valve for delivery pipe
Gas leakage on exhaust system
Open or short in A/F sensor (bank 1 sensor 1) circuit
A/F sensor (bank 1 sensor 1)
ECM
Page 2166 of 4592
± DIAGNOSTICSENGINE
DI±15
P0172
(DI±49)System too Rich (Fuel Trim)
Injector leak, blockage
Manifold absolute pressure sensor
Engine coolant temp. sensor
Ignition system
Fuel shutoff valve for delivery pipe
Gas leakage on exhaust system
Open or short in A/F sensor (bank 1 sensor 1) circuit
A/F sensor (bank 1 sensor 1)
ECM
P0180
(DI±54)Fuel Temperature Sensor ºAº
Circuit Malfunction
Open or short in fuel temperature sensor circuit for delivery
pipe
Fuel temperature sensor for delivery pipe
ECM
P0190
(DI±56)Fuel Rail Pressure Sensor Cir-
cuit MalfunctionOpen or short in fuel pressure sensor circuit for delivery pipe
Fuel pressure sensor for delivery pipe
ECM
P0335
(DI±59)Crankshaft Position Sensor ºAº
Circuit Malfunction
Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Crankshaft timing pulley
ECM
P0340
(DI±61)Camshaft Position Sensor Circuit
Malfunction
Open or short in camshaft position sensor circuit
Camshaft position sensor
Camshaft timing pulley
ECM
P0400
(DI±63)Exhaust Gas Recirculation Flow
Malfunction
Vacuum or EGR hose is connected to wrong post
Open or short in VSV circuit for EGR
VSV for EGR
EGR system
EGR vacuum modulator
EGR valve
Manifold absolute pressure sensor
ECM
P0500
(DI±69)Vehicle Speed Sensor Malfunc-
tion
Combination meter
Open or short in vehicle speed sensor circuit
Vehicle speed sensor
ECM
P0505
(DI±72)Idle Control System Malfunction
Open or short in IAC valve circuit
IAC valve is stuck or closed
Open or short in A/C switch circuit
Air induction system
ECM
*: MIL lights up
2. MANUFACTURER CONTROLLED
DTC No.
(See Page)Detection ItemTrouble AreaMIL*Memory
P1130
(DI±79)A/F Sensor Circuit Range/Perfor-
mance Malfunction (Bank 1 Sen-
sor 1)
Open or short in A/F sensor circuit
A/F sensor
Air induction system
EGR system
Fuel pressure
Injector
ECM
P1135
(DI±84)A/F Sensor Heater Circuit Mal-
function (Bank 1 Sensor 1)Open or short in heater circuit of A/F sensor
A/F sensor heater
ECM
Page 2191 of 4592
A00477
Atmosphere
Cover
Exhaust GasPlatinum
Electrode
Solid Electrolyte
(Zirconia Element)
Platinum
Electrode
Heater
Air±Fuel Ratio
(V)
2.6 4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.4
14 15 16 17 19 21 22
Coating (Ceramic)
ECM Monitored
A/F Sensor Voltage
DI±40
± DIAGNOSTICSENGINE
DTC P0125 Insufficient Coolant Temp. for Closed Loop
Fuel Control
CIRCUIT DESCRIPTION
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three±way cata-
lytic converter is used, but for the most efficient use of the three±way catalytic converter, the air±fuel ratio
must be precisely controlled so that it is always close to the stoichiometric air±fuel ratio.
The A/F sensor has the characteristic that provides output voltage
* approximately proportional to the exist-
ing air±fuel ratio. The A/F sensor output voltage
* is used to provide feedback for the ECM to control the air±
fuel ratio.
By the A/F sensor output, the ECM can determine the deviation amount from the stoichiometric air±fuel ratio
and control the proper injection time immediately. If the A/F sensor is malfunctioning, ECM is unable to per-
form accurate air±fuel ratio control.
The A/F sensor is equipped with a heater which heats the zirconia element. The heater is controlled by the
ECM. When the intake air volume is low (the temp. of the exhaust gas is low), current flows to the heater
to heat the sensor for accurate oxygen concentration detection.
*: The voltage value changes at the inside of the ECM only.
DTC No.DTC Detecting ConditionTrouble Area
P0125
After engine is warmed up, A/F sensor output* does not
change when conditions (a), (b) and (c) continue for at least
1.5 min.:
*: Output value changes at inside of ECM only
(a) Engine speed: 1,500 rpm or more
(b) Vehicle speed: 40 ± 100 km/h (25 ± 62 mph)
(c) Throttle valve is not fully closedOpen or short in A/F sensor (bank 1 sensor 1) circuit
A/F sensor (bank 1 sensor 1)
Air induction system
EGR system
Fuel pressure
Injector
Gas leakage on exhaust system
ECM
HINT:
After confirming DTC P0125, use the OBD II scan tool or TOYOTA hand-held tester to confirm voltage
output of A/F sensor from the CURRENT DATA.
The ECM controls the voltage of the AF+ and AF± terminals of the ECM to the fixed voltage. Therefore,
it is impossible to confirm the A/F sensor output voltage without OBD II scan tool or TOYOTA hand±
held tester.
DI1JU±04
Page 2193 of 4592
DI±42
± DIAGNOSTICSENGINE
2 Connect OBD II scan tool or TOYOTA hand±held tester, and read value for volt-
age output of A/F sensor (bank 1 sensor 1).
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand±held tester to the DLC3.
(b) Warm up the A/F sensor with the engine speed at 2,500 rpm for approx. 90 sec.
CHECK:
Read the voltage value of the A/F sensor on the screen of OBD II scan tool or TOYOTA hand±held tester
when you perform all the following conditions.
HINT:
The voltage of the AF+ terminal of the ECM is 3.3 V fixed and the A/F± terminal is 3.0 V fixed. Therefore,
it is impossible to check the A/F sensor output voltage at the terminals (AF+/AF±) of the ECM.
OK:
ConditionA/F Sensor Voltage Value
Engine idling
Engine racing Not remains at 3.30 V (0.660 V*)
Driving at engine speed 1,500 rpm or more and vehicle
speed 40 km/h (25 mph) or more, and operate throttle valve
open and close
Not remains at 3.30 V (0.660 V)
Not remains at 4.5 V (0.76 V*) or more
*: When you use the OBD II scan tool (excluding TOYOTA hand±held tester)
HINT:
During fuel enrichment, there is a case that the output voltage of the A/F sensor is below 2.8 V (0.56
V*), it is normal.
During fuel cut, there is a case that the output voltage of the A/F sensor is above 3.8 V (0.76 V*), it
is normal.
If the output voltage of the A/F sensor remains at 3.30 V (0.660 V*) even after performing all the above
conditions, A/F the sensor circuit may be open.
If the output voltage of the A/F sensor remains at 4.5 V (0.76 V*) or more, even after performing all
the above conditions, A/F sensor circuit may be short.
*: When you use the OBD II scan tool (excluding TOYOTA hand±held tester).
OK Go to step 10.
NG
3 Check for open and short in harness and connector between ECM and A/F sen-
sor (bank 1 sensor 1) (See page IN±29).
NG Repair or replace harness or connector.
OK
4 Check resistance of A/F sensor heater (bank 1 sensor 1) (See Pub. No. RM654U,
page SF±59).
Page 2198 of 4592
A09296BE6653A09265
ON
HT2
(±) (+)
± DIAGNOSTICSENGINE
DI±47
DTC P0141 Oxygen Sensor Heater Circuit Malfunction
(Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI±40.
DTC No.DTC Detecting ConditionTrouble Area
P0141When heater operates, heater current exceeds 2 A
(2 trip detection logic)Open or short in heater circuit of heated oxygen sensor
Htd ht
P0141Heater current of 0.2 A or less when heater operates
(2 trip detection logic)Heated oxygen sensor heater
ECM
HINT:
Sensor 1 refers to the sensor closer to the engine body.
Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to DTC P0125 on page DI±40.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air±fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Check voltage between terminals HT2 of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals HT2 of the ECM con-
nector and body ground.
HINT:
OK:
Voltage: 9 ± 14 V
OK Check and replace ECM (See page IN±29).
NG
DI00X±05
Page 2199 of 4592
DI±48
± DIAGNOSTICSENGINE
2 Check resistance of heated oxygen sensor heater (See Pub. No. RM654U, page
SF±63).
NG Replace heated oxygen sensor.
OK
Check and repair harness or connector between EFI main relay (Marking: EFI) and heated oxygen
sensor, and heated oxygen sensor and ECM (See page IN±29).
Page 2232 of 4592
± DIAGNOSTICSENGINE
DI±81
HINT:
During fuel enrichment, there is a case that the output voltage of the A/F sensor is below 2.8 V (0.56
V*), it is normal.
During fuel cut, there is a case that the output voltage of the A/F sensor is above 4.5 V (0.76 V*), it
is normal.
If the output voltage of the A/F sensor remains at 3.30 V (0.660 V*) even after performing all the above
conditions, A/F sensor circuit may be open.
If the output voltage of the A/F sensor remains at 3.8 V (0.76 V*) or more, even after performing all
the above conditions, A/F sensor circuit may be short.
*: When you use the OBD II scan tool (excluding TOYOTA hand±held tester).
OK Go to step 9.
NG
3 Check for open and short in harness and connector between ECM and A/F sen-
sor (See page IN±29).
NG Repair or replace harness or connector.
OK
4 Check resistance of A/F sensor heater (See Pub. No. RM654U, page SF±59).
NG Replace A/F sensor.
OK
5 Check air induction system (See Pub. No. RM654U, page SF±1).
NG Repair or replace.
OK
Page 2235 of 4592
A09280BE6653
A09427
HTAF ON
(±)
(+)
DI±84
± DIAGNOSTICSENGINE
DTC P1135 A/F Sensor Heater Circuit Malfunction
(Bank 1 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI±40.
DTC No.DTC Detecting ConditionTrouble Area
P1135
When heater operates, heater current exceeds 8 A
(2 trip detection logic)Open or short in heater circuit of A/F sensor
A/F h tP1135Heater current of 0.25 A or less when heater operates
(2 trip detection logic)A/F sensor heater
ECM
WIRING DIAGRAM
Refer to DTC P0125 on page DI±40.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air±fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Check voltage between terminal HTAF of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal HTAF of the ECM con-
nector and body ground.
OK:
Voltage: 9 ± 14 V
OK Check and replace ECM (See page IN±29).
NG
2 Check resistance of A/F sensor heater (See Pub. No. RM654U, page SF±59).
NG Replace A/F sensor.
OK
DI01F±07